19994028 has 48 divisors (see below), whose sum is σ = 47910240. Its totient is φ = 6488064.

The previous prime is 19994003. The next prime is 19994033. The reversal of 19994028 is 82049991.

It is a super-2 number, since 2×19994028² = 799522311329568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103500 + ... + 103692.

It is an arithmetic number, because the mean of its divisors is an integer number (998130).

Almost surely, 2^19994028 is an apocalyptic number.

It is an amenable number.

19994028 is an abundant number, since it is smaller than the sum of its proper divisors (27916212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19994028 is a wasteful number, since it uses less digits than its factorization.

19994028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 19994028 is about 4471.4682152510. The cubic root of 19994028 is about 271.4147414666.

The spelling of 19994028 in words is "nineteen million, nine hundred ninety-four thousand, twenty-eight".